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JSON Formatter

Beautify, minify & validate JSON — 100% free, runs in your browser

About the JSON Formatter

Minified JSON from an API is unreadable, and a single misplaced comma will break parsing without telling you where. This beautifies, minifies, and most usefully reports exactly what is wrong and where when the JSON is invalid.

How to use it

  1. Paste your JSON.
  2. Press Beautify to read it, or Minify to shrink it.
  3. If invalid, the error message points to the problem.

Common questions

What breaks JSON most often?

A trailing comma after the last item, single quotes instead of double, and unescaped quotes inside strings. In that order.

Is my data sent to a server?

No. Parsing happens in your browser, so you can safely paste data you would not want to upload.

Why minify?

Smaller payloads transfer faster. Minify for production, beautify for reading.

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